I'm looking for some decent sport earphones that do not completely isolate outside noise. I will use them for walking and I need to be aware of my surroundings. I would prefer ones that are sweat proof. I always have trouble getting earphones to stay put so maybe some that have the "fins" on...

I don't suppose this thing would work with my Nomad Zen 2.0, what with the propriety file system and all. It would be awesome if it did.